Apparatus for indicating ignition failures in internal-combustion engines



I s. FISHER. APPARATUS FOR INDICAIING IGNITION FAILURES IN INTERNAL COMBUSTION ENGINES.

APPLICATION mu) DEC. I9, I921 1A1 6,457, Patented y 16, 1922.

STANLEY FISHER, OE NORTEITEIELDS, EALING, ENGLAND.

inmate,

Application filed. December 19, 1921.

T 0 all whomit may concern:

Be it known that I, STANLEY FISHER, a subject of the King of Great Britain, residing at 8 Derwent Road, Northfields, Ealing W. 5, in the county of London, England, have invented certain new and useful In1- provements in or Relating to Apparatus for Indicating Ignition Failures in Internal- Combustion Engines, of which the following is a specification.

This invention relates to apparatus for indicating ignition failures in internal combustion engines, of the kind in which a small cylinder with spring-controlled piston is connected to the combustion space of a cylinder, or in the case of a multi-cylinder engine, to the combustion space of each cylinder, the movements of the piston serving to indicate whether the cylinder is or is not firing, or which of the cylinders in the case of more than one, is or is not firing.

In order that the said invention may be clearly understood and readily carried into effect the same will now be more fully described with reference to the accompanying drawing, wherein Figure 1 is a vertical section illustrating an exemplification of the indicating apparatus.

Figure 2 is a detail illustrating a modification.

A represents a portion of the cylinder of an internal combustion engine, to which the indicating cylinder B is secured by means of a screw-threaded ferrule C. In this cylinder a piston I) works somewhat loosely, the said piston being connected with a Bow den wire E, and a light confined spring F pressing on the upper surface of this piston. In the bore 0 of the ferrule C is a enlargement c in which is a ball valve G.

The movable indicating member may be an arm or a drum or disc carrying three in dications adapted to be exposed individually opposite an aperture in the indicator casing. In the example shewn in Figure 1 it is an arm H attached to a piston J working in an outer indication cylinder M. The wire E also enters the outer cylinder M and is attached to a piston J working in the said outer cylinder, a confined spring K tends to lift this piston J, which is adapted to actuate the arm H carrying three indications Specification of Letters Patent.

Patented May 116, 1922.

Serial No. 523,556.

aforesaid piston D and slacken the cable so that the spring II in the outer cylinder l /I causes the exhibition of the intermediate indication m and the first normal firing increases such pressure and in like manner causes the exhibition of the indication m of correct firing; the valve G closing immediately after the firing stroke begins owing to the pressure in the ini1er indication cylinder B exceeding that in the combustion space, causes this indication m to be maintained, this valve remains closed during the exhaust and induction strokes, in which the pressure in the combustion space is small, and also during the following compression stroke; but meanwhile the gases in the indication cylinder B leaking past the piston D tend to produce an equalization of the pressures on opposite sides of the said piston. If new ignition duly occurs, the valve G opens, the gases entering the inner indication cylinder counteract this tendency to equalization; but when ignition fails, the intermediate indication m will very soon be again exhibited, assuming that the compression takes place with regularity. If however the compression is faulty, so that the valve G remains continuously closed, the spring F actuating the piston becomes fully expanded, and the indication or will be exhibited.

Instead of the spring It: being located below the arm H and adapted to push against the pistons J at the foot of the said arm, it may be anchored to the top of the indictor casing and attached to the arm H in such manner as to pull the arm upwardly so far as is permitted by the movements of the wire E, as shown in Figure 2. Where the indicating member performing the functions of the arm H is a drum or disc, the wire E or a more flexible extension thereof could be passed over a pulley on the shaft or stud of the said drum or disc, and a V0- lute spring on the said shaft could be arranged to exert an influence thereon acting in the opposite direction to that of the spring F, the spring F however being in all modifications stronger than the spring of the movable or rotary indicating member.

What I claim and desire to secure by Letters Patent of the United States is 1. An indicating device of the class described, comprising a housing having a nonreturn valve connection with the combu tion chamber of an engine, a normally spring operated piston in said housing, a movable indicator connected to said piston, and means for operating said indicator against the action of said spring.

2. An indicating device of the class described, comprising a cylindrical housing having anon-return valve connection with the combustion chamber of an engine, a normally spring operated piston in said housing, a spring actuated indicator positioned above said housing and connected to said piston, and means for actuating said indicator against the tension of the spring in said housing.

8. An indicating device of the class described comprising a cylindrical housing provided with a normally spring operated piston, regulating means for admittingpressure into said housing to oppose the action of the spring against the said piston, and a movable indicator connected to said piston.

4:. An indicating device of the class described comprising a cylindrical housing provided with a normally spring operated piston, regulating means for admitting pressure into said housing to oppose the action of the spring against the said piston, means in said housing for equalizing the pressure on opposite sides of said piston, and a movable indicator connected to said piston.

5. An indicating device of the class described comprising a cylindrical housing provided with a normally spring operated piston, a non-return valve, means for admitting pressure into said housing to oppose the action of the spring against the said piston, an indicator, a Bowden wire connecting said indicator to the piston, and means for registering the igniting failure of the engine in a casing.

STANLEY FISHER, 

